Mercurial > pygar

     1 /// The MIT License

     2 

     3 // Copyright (c) 2009 Massachusetts Institute of Technology

     4 

     5 // Permission is hereby granted, free of charge, to any person obtaining a copy

     6 // of this software and associated documentation files (the "Software"), to deal

     7 // in the Software without restriction, including without limitation the rights

     8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

     9 // copies of the Software, and to permit persons to whom the Software is

    10 // furnished to do so, subject to the following conditions:

    11 

    12 // The above copyright notice and this permission notice shall be included in

    13 // all copies or substantial portions of the Software.

    14 

    15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

    16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

    17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

    18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

    19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

    20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

    21 // THE SOFTWARE.

    22 

    23 

    24 import Connectable::*;

    25 import GetPut::*;

    26 import ClientServer::*;

    27 import RegFile::*;

    28 

    29 import FIFO::*;

    30 import FIFOF::*;

    31 import SFIFO::*;

    32 import RWire::*;

    33 

    34 import Trace::*;

    35 import BFIFO::*;

    36 import MemTypes::*;

    37 import ProcTypes::*;

    38 import BRegFile::*;

    39 import BranchPred::*;

    40 //import PathTypes::*;  This is only there to force the debugging

    41 

    42 //AWB includes

    43 `include "asim/provides/low_level_platform_interface.bsh"

    44 `include "asim/provides/soft_connections.bsh"

    45 `include "asim/provides/common_services.bsh"

    46 

    47 // Local includes

    48 //`include "asim/provides/processor_library.bsh" (included above directly)

    49 `include "asim/rrr/remote_server_stub_AUDIOCORERRR.bsh"

    50 `include "asim/provides/common_services.bsh"

    51 `include "asim/dict/STATS_PROCESSOR.bsh"

    52 `include "asim/provides/processor_library.bsh"

    53 

    54 // Local includes. Look for the correspondingly named .awb files

    55 // workspace/labs/src/mit-6.375/modules/bluespec/mit-6.375/common/

    56 // to find the actual Bluespec files which are used to generate

    57 // these includes.  These files are specific to this audio processing

    58 // pipeline

    59 

    60 `include "asim/provides/audio_pipe_types.bsh"

    61 

    62 //interface CPUToHost;

    63 //  method Bit#(32) cpuToHost(int req);

    64 //endinterface

    65 

    66 interface Proc;

    67 

    68   // Interface from processor to caches

    69   interface Client#(DataReq,DataResp) dmem_client;

    70   interface Client#(InstReq,InstResp) imem_client;

    71 

    72   // Interface for enabling/disabling statistics on the rest of the core

    73   interface Get#(Bool) statsEn_get;

    74 

    75 //  // Interface to host

    76 //  interface CPUToHost tohost;

    77 

    78   // Interface to Audio Pipeline

    79   interface Get#(AudioProcessorUnit) sampleOutput;

    80 	

    81 endinterface

    82 

    83 //The full interface for this is as below in the common file for audioProcessorTypes.bsv

    84 //interface AudioOut;

    85 //  interface Get#(AudioProcessorUnit) audioSampleOutput;

    86 //endinterface

    87 

    88 //interface AudioIn;

    89 //  interface Put#(AudioProcessorUnit) audioSampleInput;

    90 //endinterface	

    91 

    92 typedef enum { PCgen, Exec, Writeback } Stage deriving(Eq,Bits);

    93 

    94 //-----------------------------------------------------------

    95 // Register file module

    96 //-----------------------------------------------------------

    97 

    98 interface BRFile;

    99    method Action   wr( Rindx rindx, Bit#(32) data );

   100    method Bit#(32) rd1( Rindx rindx );

   101    method Bit#(32) rd2( Rindx rindx );

   102 endinterface

   103 

   104 module mkBRFile( BRFile );

   105    

   106    RegFile#(Rindx,Bit#(32)) rfile <- mkBRegFile();

   107    

   108    method Action wr( Rindx rindx, Bit#(32) data );

   109       rfile.upd( rindx, data );

   110    endmethod

   111    

   112    method Bit#(32) rd1( Rindx rindx );

   113       return ( rindx == 0 ) ? 0 : rfile.sub(rindx);

   114    endmethod

   115    

   116    method Bit#(32) rd2( Rindx rindx );

   117       return ( rindx == 0 ) ? 0 : rfile.sub(rindx);

   118    endmethod

   119 

   120 endmodule

   121 

   122 //-----------------------------------------------------------

   123 // Helper functions

   124 //-----------------------------------------------------------

   125 

   126 function Bit#(32) slt( Bit#(32) val1, Bit#(32) val2 );

   127    return zeroExtend( pack( signedLT(val1,val2) ) );

   128 endfunction

   129 

   130 function Bit#(32) sltu( Bit#(32) val1, Bit#(32) val2 );

   131    return zeroExtend( pack( val1 < val2 ) );

   132 endfunction

   133 

   134 function Bit#(32) rshft( Bit#(32) val );

   135    return zeroExtend(val[4:0]);

   136 endfunction

   137 

   138 

   139 //-----------------------------------------------------------

   140 // Find funct for wbQ

   141 //-----------------------------------------------------------

   142 function Bool findwbf(Rindx fVal, WBResult cmpVal);

   143   case (cmpVal) matches   

   144      tagged WB_ALU  {data:.res, dest:.rd} :

   145 	return (fVal == rd);

   146      tagged WB_Load .rd  :

   147 	return (fVal == rd);

   148      tagged WB_Store .st :

   149 	return False;

   150      tagged WB_Host .x   :

   151 	return False;

   152   endcase

   153 endfunction

   154 

   155      

   156 //-----------------------------------------------------------

   157 // Stall funct for wbQ

   158 //-----------------------------------------------------------

   159 function Bool stall(Instr inst, SFIFO#(WBResult, Rindx) f);

   160    case (inst) matches

   161       	 // -- Memory Ops ------------------------------------------------      

   162       tagged LW .it :

   163 	 return f.find(it.rbase);

   164       tagged SW {rsrc:.dreg, rbase:.addr, offset:.o} :

   165 	 return (f.find(addr) ||  f.find2(dreg));

   166 

   167 	 // -- Simple Ops ------------------------------------------------      

   168       tagged ADDIU .it : return f.find(it.rsrc);

   169       tagged SLTI  .it : return f.find(it.rsrc);

   170       tagged SLTIU .it : return f.find(it.rsrc);

   171       tagged ANDI  .it : return f.find(it.rsrc);

   172       tagged ORI   .it : return f.find(it.rsrc);

   173       tagged XORI  .it : return f.find(it.rsrc);

   174       

   175       tagged LUI   .it : return f.find(it.rdst);  //this rds/wrs itself

   176       tagged SLL   .it : return f.find(it.rsrc);

   177       tagged SRL   .it : return f.find(it.rsrc);

   178       tagged SRA   .it : return f.find(it.rsrc);

   179       tagged SLLV  .it : return (f.find(it.rsrc) || f.find(it.rshamt));

   180       tagged SRLV  .it : return (f.find(it.rsrc) || f.find(it.rshamt));

   181       tagged SRAV  .it : return (f.find(it.rsrc) || f.find(it.rshamt));

   182       tagged ADDU  .it : return (f.find(it.rsrc1) || f.find2(it.rsrc2));

   183       tagged SUBU  .it : return (f.find(it.rsrc1) || f.find2(it.rsrc2));

   184       tagged AND   .it : return (f.find(it.rsrc1) || f.find2(it.rsrc2));

   185       tagged OR    .it : return (f.find(it.rsrc1) || f.find2(it.rsrc2));

   186       tagged XOR   .it : return (f.find(it.rsrc1) || f.find2(it.rsrc2));

   187       tagged NOR   .it : return (f.find(it.rsrc1) || f.find2(it.rsrc2));

   188       tagged SLT   .it : return (f.find(it.rsrc1) || f.find2(it.rsrc2));

   189       tagged SLTU  .it : return (f.find(it.rsrc1) || f.find2(it.rsrc2));

   190    

   191 

   192       // -- Branches --------------------------------------------------

   193     

   194       tagged BLEZ  .it : return (f.find(it.rsrc));

   195       tagged BGTZ  .it : return (f.find(it.rsrc));

   196       tagged BLTZ  .it : return (f.find(it.rsrc));

   197       tagged BGEZ  .it : return (f.find(it.rsrc));

   198       tagged BEQ   .it : return (f.find(it.rsrc1) || f.find2(it.rsrc2));

   199       tagged BNE   .it : return (f.find(it.rsrc1) || f.find2(it.rsrc2));

   200       

   201       // -- Jumps -----------------------------------------------------

   202       

   203       tagged J     .it : return False;

   204       tagged JR    .it : return f.find(it.rsrc);

   205       tagged JALR  .it : return f.find(it.rsrc);

   206       tagged JAL   .it : return False;

   207       

   208       // -- Cop0 ------------------------------------------------------

   209       

   210       tagged MTC0  .it : return f.find(it.rsrc);      

   211       tagged MFC0  .it : return False; 

   212 

   213       // -- Illegal ---------------------------------------------------

   214 

   215       default : return False;

   216 

   217     endcase

   218 endfunction

   219 //-----------------------------------------------------------

   220 // Reference processor

   221 //-----------------------------------------------------------

   222 

   223 

   224 //(* doc = "synthesis attribute ram_style mkProc distributed;" *)

   225 //(* synthesize *)

   226 

   227 module  [CONNECTED_MODULE] mkProc( Proc );

   228 

   229    //-----------------------------------------------------------

   230    // Debug port

   231    

   232    ServerStub_AUDIOCORERRR server_stub <- mkServerStub_AUDIOCORERRR();   

   233 

   234    

   235    //-----------------------------------------------------------

   236    // State

   237 

   238    // Standard processor state

   239    

   240    Reg#(Addr)  pc    <- mkReg(32'h00001000);

   241    Reg#(Epoch) epoch <- mkReg(0);

   242    Reg#(Stage) stage <- mkReg(PCgen);

   243    BRFile      rf    <- mkBRFile;

   244 

   245    // Branch Prediction

   246    BranchPred               bp <- mkBranchPred();

   247    FIFO#(PCStat)        execpc <- mkLFIFO();

   248    

   249    // Pipelines

   250    FIFO#(PCStat)           pcQ <-mkSizedFIFO(3);

   251    SFIFO#(WBResult, Rindx) wbQ <-mkSFIFO(findwbf);

   252 

   253    // NEED TO ADD CAPABILITY FOR RESET (should be able to just say if I get valid in and these are flagged, clear them.

   254    Reg#(Bit#(32)) cp0_tohost   <- mkReg(0);

   255    Reg#(Bit#(32)) cp0_fromhost <- mkReg(0);

   256    Reg#(Bool)     cp0_statsEn  <- mkReg(False);

   257    Reg#(Bool)     cp0_audioEOF <- mkReg(False);  // Register to let code that EOF is reached

   258    Reg#(Bool)     cp0_progComp <- mkReg(False);  // Register to let processor know that the program is complete (as this terminates)

   259     

   260    // Memory request/response state

   261    

   262    FIFO#(InstReq)  instReqQ    <- mkBFIFO1();

   263    FIFO#(InstResp) instRespQ   <- mkFIFO();

   264 

   265    FIFO#(DataReq)  dataReqQ    <- mkBFIFO1();

   266    FIFO#(DataResp) dataRespQ   <- mkFIFO();

   267 

   268    // Audio I/O

   269    FIFO#(AudioProcessorUnit) inAudioFifo <- mkFIFO;

   270    FIFO#(AudioProcessorUnit) outAudioFifo <- mkFIFO;

   271 

   272 

   273    // Statistics state (2010)

   274 //   Reg#(Stat) num_cycles <- mkReg(0);

   275 //   Reg#(Stat) num_inst <- mkReg(0);

   276 

   277    //Or:

   278    // Statistics state

   279    STAT num_cycles <- mkStatCounter(`STATS_PROCESSOR_CYCLE_COUNT);

   280    STAT num_inst <- mkStatCounter(`STATS_PROCESSOR_INST_COUNT);

   281 

   282    //-----------------------------------------------------------

   283    // Rules

   284 

   285    (* descending_urgency = "exec, pcgen" *)

   286    rule pcgen; //( stage == PCgen );

   287       let pc_plus4 = pc + 4;

   288 

   289       traceTiny("mkProc", "pc",pc);

   290       traceTiny("mkProc", "pcgen","P");

   291       instReqQ.enq( LoadReq{ addr:pc, tag:epoch} );

   292       

   293       let next_pc = bp.get(pc);

   294       if (next_pc matches tagged Valid .npc) 

   295 	begin

   296 	   pcQ.enq(PCStat {qpc:pc, qnxtpc:npc, qepoch:epoch});

   297 	   pc <= npc;

   298 	end

   299      else

   300 	 begin

   301 	   pcQ.enq(PCStat {qpc:pc, qnxtpc:pc_plus4, qepoch:epoch});

   302 	   pc <= pc_plus4;

   303 	 end

   304       

   305    endrule

   306 

   307    rule discard (instRespQ.first() matches tagged LoadResp .ld

   308 					      &&& ld.tag != epoch);

   309       traceTiny("mkProc", "stage", "D");

   310       instRespQ.deq();

   311    endrule

   312 

   313    (* conflict_free = "exec, writeback" *)		      

   314    rule exec (instRespQ.first() matches tagged LoadResp.ld

   315 	      &&& (ld.tag == epoch)

   316 	      &&& unpack(ld.data) matches .inst

   317               &&& !stall(inst, wbQ));

   318 

   319       // Some abbreviations

   320       let sext = signExtend;

   321       let zext = zeroExtend;

   322       let sra  = signedShiftRight;

   323       

   324       // Get the instruction

   325       

   326       instRespQ.deq();

   327       Instr inst 

   328       = case ( instRespQ.first() ) matches

   329 	   tagged LoadResp  .ld : return unpack(ld.data);

   330 	   tagged StoreResp .st : return ?;

   331 	endcase;

   332 

   333       // Get the PC info

   334       let instrpc = pcQ.first().qpc;

   335       let pc_plus4 = instrpc + 4;

   336       

   337       Bool branchTaken = False;

   338       Addr newPC = pc_plus4;

   339 

   340       // Tracing

   341       traceTiny("mkProc", "exec","X");

   342       traceTiny("mkProc", "exInstTiny",inst);

   343       traceFull("mkProc", "exInstFull",inst);

   344 

   345       case ( inst ) matches

   346 

   347 	 // -- Memory Ops ------------------------------------------------      

   348 

   349 	 tagged LW .it : 

   350 	    begin

   351                Addr addr = rf.rd1(it.rbase) + sext(it.offset);

   352                dataReqQ.enq( LoadReq{ addr:addr, tag:zeroExtend(it.rdst) } );

   353                wbQ.enq(tagged WB_Load it.rdst);

   354 	    end

   355 

   356 	 tagged SW .it : 

   357 	    begin

   358                Addr addr = rf.rd1(it.rbase) + sext(it.offset);

   359                dataReqQ.enq( StoreReq{ tag:0, addr:addr, data:rf.rd2(it.rsrc) } );

   360                wbQ.enq(tagged WB_Store);

   361 	    end

   362 

   363 	 // -- Simple Ops ------------------------------------------------      

   364 

   365 	 tagged ADDIU .it : 

   366 	    begin

   367 	       Bit#(32) result = rf.rd1(it.rsrc) + sext(it.imm);

   368 	       wbQ.enq(tagged WB_ALU {data:result, dest:it.rdst});

   369 	    end

   370 	 tagged SLTI  .it : wbQ.enq(tagged WB_ALU {dest:it.rdst, data:slt( rf.rd1(it.rsrc), sext(it.imm) )});

   371 	 tagged SLTIU .it : wbQ.enq(tagged WB_ALU {dest:it.rdst, data:sltu( rf.rd1(it.rsrc), sext(it.imm) ) });

   372 	 tagged ANDI  .it : 

   373 	    begin

   374 	       Bit#(32) zext_it_imm = zext(it.imm);

   375 	       wbQ.enq(tagged WB_ALU {dest:it.rdst, data:(rf.rd1(it.rsrc) & zext_it_imm)} );

   376 	    end

   377 	 tagged ORI   .it : 

   378 	    begin

   379 	       Bit#(32) zext_it_imm = zext(it.imm);

   380 	       wbQ.enq(tagged WB_ALU {dest:it.rdst, data:(rf.rd1(it.rsrc) | zext_it_imm)} );

   381 	    end

   382 	 tagged XORI  .it : 

   383 	    begin

   384 	       Bit#(32) zext_it_imm = zext(it.imm);

   385 	       wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(rf.rd1(it.rsrc) ^ zext_it_imm )});

   386 	    end

   387 	 tagged LUI   .it : 

   388 	    begin

   389 	       Bit#(32) zext_it_imm = zext(it.imm);

   390 	       wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(zext_it_imm << 32'd16) });

   391 	    end

   392 	 

   393 	 tagged SLL   .it : 

   394 	    begin

   395 	       Bit#(32) zext_it_shamt = zext(it.shamt);

   396 	       wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(rf.rd1(it.rsrc) << zext_it_shamt )} );

   397 	    end

   398 	 tagged SRL   .it : 

   399 	    begin

   400 	       Bit#(32) zext_it_shamt = zext(it.shamt);

   401 	       wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(rf.rd1(it.rsrc) >> zext_it_shamt )});

   402 	    end

   403 	 tagged SRA   .it : 

   404 	    begin

   405 	       Bit#(32) zext_it_shamt = zext(it.shamt);

   406 	       wbQ.enq(tagged WB_ALU {dest: it.rdst, data:sra( rf.rd1(it.rsrc), zext_it_shamt )});

   407 	    end

   408 	 tagged SLLV  .it : wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(rf.rd1(it.rsrc) << rshft(rf.rd2(it.rshamt)) )});

   409 	 tagged SRLV  .it : wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(rf.rd1(it.rsrc) >> rshft(rf.rd2(it.rshamt)) )} );

   410 	 tagged SRAV  .it : wbQ.enq(tagged WB_ALU {dest: it.rdst, data:sra( rf.rd1(it.rsrc), rshft(rf.rd2(it.rshamt)) ) });

   411 	 tagged ADDU  .it : wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(rf.rd1(it.rsrc1) + rf.rd2(it.rsrc2) )} );

   412 	 tagged SUBU  .it : wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(rf.rd1(it.rsrc1) - rf.rd2(it.rsrc2) )} );

   413 	 tagged AND   .it : wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(rf.rd1(it.rsrc1) & rf.rd2(it.rsrc2) )} );

   414 	 tagged OR    .it : wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(rf.rd1(it.rsrc1) | rf.rd2(it.rsrc2) )} );

   415 	 tagged XOR   .it : wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(rf.rd1(it.rsrc1) ^ rf.rd2(it.rsrc2) )} );

   416 	 tagged NOR   .it : wbQ.enq(tagged WB_ALU {dest: it.rdst, data:(~(rf.rd1(it.rsrc1) | rf.rd2(it.rsrc2)) )} );

   417 	 tagged SLT   .it : wbQ.enq(tagged WB_ALU {dest: it.rdst, data:slt( rf.rd1(it.rsrc1), rf.rd2(it.rsrc2) ) });

   418 	 tagged SLTU  .it : wbQ.enq(tagged WB_ALU {dest: it.rdst, data:sltu( rf.rd1(it.rsrc1), rf.rd2(it.rsrc2) ) });

   419 

   420 	 // -- Branches --------------------------------------------------

   421 

   422 	 tagged BLEZ  .it : 

   423             if ( signedLE( rf.rd1(it.rsrc), 0 ) )

   424 	       begin

   425 		  newPC = pc_plus4 + (sext(it.offset) << 2);

   426 		  branchTaken = True;

   427 	       end

   428 

   429 	 tagged BGTZ  .it : 

   430             if ( signedGT( rf.rd1(it.rsrc), 0 ) ) 

   431                begin 

   432 		  newPC = pc_plus4 + (sext(it.offset) << 2);

   433 		  branchTaken = True;

   434 	       end

   435 

   436 	 tagged BLTZ  .it : 

   437             if ( signedLT( rf.rd1(it.rsrc), 0 ) )

   438                begin 

   439 		  newPC = pc_plus4 + (sext(it.offset) << 2);

   440 		  branchTaken = True;

   441 	       end

   442 		  

   443 	 tagged BGEZ  .it : 

   444             if ( signedGE( rf.rd1(it.rsrc), 0 ) )

   445                begin 

   446 		  newPC = pc_plus4 + (sext(it.offset) << 2);		  

   447 		  branchTaken = True;

   448 	       end

   449 

   450       tagged BEQ   .it : 

   451         if ( rf.rd1(it.rsrc1) == rf.rd2(it.rsrc2) )

   452           begin 

   453 	     newPC = pc_plus4 + (sext(it.offset) << 2);

   454 	     branchTaken = True;

   455 	  end

   456 

   457       tagged BNE   .it : 

   458         if ( rf.rd1(it.rsrc1) != rf.rd2(it.rsrc2) )

   459           begin 

   460 	     newPC = pc_plus4 + (sext(it.offset) << 2);

   461 	     branchTaken = True;

   462 	  end

   463 

   464       // -- Jumps -----------------------------------------------------

   465       

   466       tagged J     .it : 

   467         begin 

   468 	   newPC = { pc_plus4[31:28], it.target, 2'b0 };

   469 	   branchTaken = True;

   470 	end

   471       

   472       tagged JR    .it : 

   473         begin 

   474 	   newPC = rf.rd1(it.rsrc);

   475 	   branchTaken = True;

   476 	end

   477 

   478       tagged JAL   .it : 

   479        begin

   480           wbQ.enq(tagged WB_ALU {dest:31, data:pc_plus4 });

   481           newPC = { pc_plus4[31:28], it.target, 2'b0 };		  

   482 	  branchTaken = True;

   483        end

   484 

   485       tagged JALR  .it : 

   486        begin

   487           wbQ.enq(tagged WB_ALU {dest:it.rdst, data:pc_plus4 });

   488           newPC = rf.rd1(it.rsrc);

   489 	  branchTaken = True;

   490        end

   491 

   492       // -- Cop0 ------------------------------------------------------

   493       

   494       tagged MTC0  .it : //Recieve things from host computer

   495 	 begin

   496 	    $display( " PROCESSOR MTC0 call\n");

   497             case ( it.cop0dst )

   498 	       5'd10 : cp0_statsEn <= unpack(truncate(rf.rd1(it.rsrc)));

   499 	       5'd21 : cp0_tohost  <= truncate(rf.rd1(it.rsrc));

   500 	       5'd26 : cp0_progComp <= unpack(truncate(rf.rd1(it.rsrc))); //states audio program completed and termination okay

   501  	       5'd27 : outAudioFifo.enq(tagged Sample unpack(truncate(rf.rd1(it.rsrc))));  //Bit size is 16 not 32 

   502 	       default :

   503 	       $display( " RTL-ERROR : %m : Illegal MTC0 cop0dst register!" );

   504 	    endcase

   505 	    wbQ.enq(tagged WB_Host 0); //no idea wwhat this actually should be.

   506 	 end

   507 

   508 //this is host stuff?

   509       tagged MFC0  .it :  //Things out

   510 	 begin

   511 	    $display( " PROCESSOR MFC0 call\n");

   512             case ( it.cop0src )

   513 	    // not actually an ALU instruction but don't have the format otherwise

   514                5'd10 : wbQ.enq(tagged WB_ALU {dest:it.rdst, data:zext(pack(cp0_statsEn)) });

   515                5'd20 : wbQ.enq(tagged WB_ALU {dest:it.rdst, data:cp0_fromhost });

   516                5'd21 : wbQ.enq(tagged WB_ALU {dest:it.rdst, data:cp0_tohost   });

   517 	       5'd25 : begin

   518 			  $display( "**** EOF Requested\n ");

   519 			  wbQ.enq(tagged WB_ALU {dest:it.rdst, data:zext(pack(cp0_audioEOF)) });  // Reading clears bit

   520 			  cp0_audioEOF <= False;

   521 		       end

   522 	       5'd28 : begin

   523 			  $display( "***** Reqesting Sample \n");

   524 			  let sample = inAudioFifo.first();        // is this going to cause perf. delay?

   525 			  if (sample matches tagged Sample .audio) // if it is EOF another rule sets the cp0_audioEOF  

   526 	      		     wbQ.enq(tagged WB_ALU {dest:it.rdst, data:zext(pack(audio)) });  // do I need pack?

   527 			  else $display ( "Audio File EOF Reached.  Invalid sample request.");

   528 			  inAudioFifo.deq();

   529 		       end

   530               default : 

   531                 $display( " RTL-ERROR : %m : Illegal MFC0 cop0src register!" );

   532             endcase

   533 	end

   534 

   535       // -- Illegal ---------------------------------------------------

   536 

   537       default : 

   538         $display( " RTL-ERROR : %m : Illegal instruction !" );

   539 

   540     endcase

   541 

   542 //evaluate branch prediction

   543      Addr ppc = pcQ.first().qnxtpc; //predicted branch

   544      if (ppc != newPC) //prediction wrong

   545        begin

   546 	  epoch <= pcQ.first().qepoch + 1;

   547 	  bp.upd(instrpc, newPC); //update branch predictor

   548 	  pcQ.clear();

   549 	  pc <= newPC;

   550        end

   551      else

   552 	pcQ.deq();

   553 

   554     if ( cp0_statsEn )

   555       num_inst.incr();

   556 

   557   endrule

   558 

   559   rule writeback; // ( stage == Writeback );

   560      traceTiny("mkProc", "writeback","W");

   561      

   562 

   563     // get what to do off the writeback queue

   564      wbQ.deq();

   565      case (wbQ.first()) matches

   566 	tagged WB_ALU {data:.res, dest:.rdst} : rf.wr(rdst, res);

   567 	tagged WB_Load .regWr : 

   568 	   begin

   569 	      dataRespQ.deq();

   570 	      if (dataRespQ.first() matches tagged LoadResp .ld)

   571 		rf.wr(truncate(ld.tag), ld.data); // no need to use Rindx from queue?  Duplicate?

   572 	   end

   573 	tagged WB_Store : dataRespQ.deq();

   574 	tagged WB_Host .dat : noAction;

   575      endcase

   576            

   577   endrule

   578 

   579   rule inc_num_cycles;

   580     if ( cp0_statsEn )

   581       num_cycles.incr();

   582   endrule

   583 

   584 (* conservative_implicit_conditions *)

   585   rule handleCPUToHost;

   586    let req <- server_stub.acceptRequest_ReadCPUToHost();

   587     case (req)

   588      0: server_stub.sendResponse_ReadCPUToHost(cp0_tohost);

   589      1: server_stub.sendResponse_ReadCPUToHost(pc);

   590      2: server_stub.sendResponse_ReadCPUToHost(zeroExtend(pack(stage)));

   591     endcase

   592   endrule

   593 

   594  // for now, we don't do anything.

   595 //  rule connectAudioReqResp;

   596 //    $display("rlm: PROCESSOR copies a datum\n");

   597 //    outAudioFifo.enq(inAudioFifo.first());

   598 //    inAudioFifo.deq;

   599 //  endrule

   600 

   601   rule flagAudioEnd (inAudioFifo.first() matches tagged EndOfFile);

   602      $display (" Proc Says End Audio Flag Set ");

   603      cp0_audioEOF <= True;

   604      inAudioFifo.deq;

   605   endrule

   606 

   607   rule sendAudioEnd (cp0_progComp);

   608      $display (" PROCESSOR Says Program Complete ");

   609      outAudioFifo.enq(tagged EndOfFile);

   610      cp0_progComp <= False;  //only send one.  And functions to reset

   611   endrule

   612 

   613   // Server items & rules:

   614    

   615    rule feedInput;

   616      let command <- server_stub.acceptRequest_SendUnprocessedStream();

   617      AudioProcessorControl ctrl = unpack(truncate(command.ctrl));

   618      if(ctrl == EndOfFile)

   619 	begin

   620 	  $display("lsp: PROCESSOR received EOF   ");

   621           inAudioFifo.enq(tagged EndOfFile);

   622        end

   623      else 

   624 	begin

   625 	  $display("lsp: PROCESSOR received Data   ");

   626           inAudioFifo.enq(tagged Sample unpack(truncate(command.sample)));

   627        end

   628    endrule     

   629   

   630  

   631   //-----------------------------------------------------------

   632   // Methods

   633 

   634   interface Client imem_client;

   635     interface Get request  = fifoToGet(instReqQ);

   636     interface Put response = fifoToPut(instRespQ);

   637   endinterface

   638 

   639   interface Client dmem_client;

   640     interface Get request  = fifoToGet(dataReqQ);

   641     interface Put response = fifoToPut(dataRespQ);

   642   endinterface

   643 

   644   interface Get statsEn_get = toGet(asReg(cp0_statsEn));

   645 

   646 //  interface CPUToHost tohost;

   647 //    method Bit#(32) cpuToHost(int req);

   648 //      return (case (req)

   649 //       0: cp0_tohost;

   650 //       1: pc;

   651 //       2: zeroExtend(pack(stage));

   652 //      endcase);

   653 //    endmethod

   654 //  endinterface

   655      

   656   interface Get sampleOutput = fifoToGet(outAudioFifo);

   657 

   658 endmodule

   659
author	rlm
date	Tue, 04 May 2010 12:08:19 -0400
parents	2c8166d205d5
children	14f7a7ace3f5